It depends when & where they were spotted. Adidas typically has an exclusivity clause which states: Each team, including all participants shall wear only Adidas products when involved in any team events, official school events that includes games or practice, any filming, photographing, and participating in or hosting any clinics.
If it’s just someone randomly seen in some Nike, Pumas, etc. then this means absolutely nothing, but if they were hosting some recruits, then yeah, that would mean something.